Albert Wisner Library — "Big Ideas on Small Spaces," works by Joan Schwartzman in the Community Room and Gallery, through March 31, 1 McFarland Drive, Warwick. Also: "Winter Expressions," a community exhibit on display on the main level and in the Board Room, through March 19. Hours 9 a.m.-8 p.m. Mon.-Thurs., 9 a.m.-5 p.m. Fri.-Sat., 11 a.m.-5 p.m. last Fri., noon-4 p.m. Sun. 986-1047. albertwisnerlibrary.org.

GCCA Catskill Gallery — "Visitors, Visitations, Visions" combines sci-fi, fantasy and whimsy in a group show of works in all media by 17 Hudson Valley artists, through March 9, 398 Main St., Catskill. Hours 10 a.m.-5 p.m. Mon.-Sat. 518-943-3400. greenearts.org.

Karpeles Manuscript Library Museum — "Spiritualism," documents and manuscript materials from both Sir Arthur Conan Doyle and Harry Houdini on both sides of the issue of spiritualism, including material on seances, magic, and the opposing beliefs of the two men, through April 28. 94 Broadway, Newburgh. Also: "Up Close and Personal," works by F.T. Mitchell, through April 28. Hours 10 a.m.-4 p.m. Thurs.-Sat., noon-4 p.m. Sun. Free admission. 569-4997. karpeles.com.

Wallkill Town Hall — Works of landscapes, farm animals and skyscapes by Sandy Spitzer, through March 31, 99 Tower Drive, Building A, Town of Wallkill. On view Mon.-Fri.; call for hours: 692-7800.

Washington's Headquarters State Historic Site — "Unpacked & Rediscovered: Selections From Washington's Headquarters' Collection," 84 Liberty St., Newburgh. New exhibit features more than 1,300 rare, curious, and important objects not seen by the public for many years. Admission $4, $3 senior citizens and students age 13 and older, free age 12 and younger. Hours 10 a.m.-3 p.m. Thurs.-Sat. 562-1195. facebook.com/washingtonsheadquarters.